Portable odor quantitative detector

Abstract

The present application discloses a portable odor detector and a method for operating the same, especially for a disposable hygiene product or its raw materials, comprising a housing, a display screen, a battery assembly, a circuit board and a sampling unit, wherein the sampling unit comprises a heat-resistant housing in which a detection chamber is defined, an odor sensor is arranged in the detection chamber.

The invention claimed is: 
     
       1. A portable odor detector, especially for a disposable hygiene product or its raw materials, comprising a housing, a display screen, a battery assembly, a circuit board and a sampling unit, the circuit board being electrically connected to the display screen, the battery assembly and the sampling unit, and the battery assembly and the sampling unit being held within the housing, wherein the sampling unit comprises a heat-resistant housing in which a detection chamber is defined, an odor sensor is arranged in the detection chamber, the sampling unit comprises an air pump having a suction port in airtight communication with the detection chamber,
 wherein an airflow sampling passage and an airflow returning passage are defined in the heat-resistant housing such that the two passages are in airtight communication with the detection chamber, 
 wherein the portable odor detector further comprises a pump base which is coupled to the air pump, wherein two connectors are secured on a side of the pump base, wherein one of the connectors is in communication with the air flow sampling passage and the other connector is in communication with the airflow returning passage, 
 wherein the housing in which the battery assembly and the sampling unit are held comprises an opening through which one of the connectors at least partially passes and another opening through which the other connector at least partially passes, 
 wherein by operating the air pump, a test airflow from an object to be tested can be sucked into the detection chamber through the airflow sampling passage and then discharged out through the airflow returning passage, 
 wherein the odor sensor can heat the airflow in the detection chamber so as to decompose gas molecules of the test airflow into charged ions which can be converted to electrical signals, which signals can be transmitted to the circuit board for storage and/or displayed on the display screen as test results, and, 
 wherein the portable odor detector further comprises a piercing unit, the piercing unit includes a sampling needle tube and a returning needle tube, each needle tube is hollow and has a free end which is sharp and closed, the sampling needle tube has an internal passage in airtight communication with the airflow sampling passage, the returning needle tube has an internal passage in airtight communication with the airflow returning passage, and each needle tube is provided with a radial aperture adjacent the sharp free end, which radial aperture is in communication with the internal passage. 
 
     
     
       2. The portable odor detector according to  claim 1 , wherein the sampling needle tube is longer than the returning needle tube. 
     
     
       3. The portable odor detector according to  claim 1 , wherein the odor sensor has a sensor resolution in the range of 2 to 8 μg/L and an operating temperature in the range of 300° C. to 400° C. 
     
     
       4. The portable odor detector according to  claim 1 , wherein the heat-resistant housing of the sampling unit is made of aluminum alloy. 
     
     
       5. The portable odor detector according to  claim 1 , wherein the battery assembly comprises a rechargeable battery. 
     
     
       6. The portable odor detector according to  claim 1 , wherein the display screen is a touch screen which can be used to control the sampling unit. 
     
     
       7. The portable odor detector according to  claim 1 , wherein the airflow sampling passage is substantially parallel to the airflow returning passage, and the sampling needle tube is substantially parallel to the returning needle tube. 
     
     
       8. A method for operating a portable odor detector according to  claim 1 , comprising:
 powering on the portable odor detector and activating its odor sensor only; 
 activating an air pump of the portable odor detector only after a first standby time; 
 connecting an airflow sampling passage of the portable odor detector to a object to be tested, only after a second standby time, to carry out odor detection. 
 
     
     
       9. The method for operating a portal odor detector according to  claim 8 , wherein during the odor detection, prior to each odor test, separating the portable odor detector from the object to be tested, activating the air pump of the portable odor detector and waiting for the second standby time. 
     
     
       10. The method for operating a portal odor detector according to  claim 8 , wherein the first standby time is greater than the second standby time.